Q38 · CSIR-NET Chemistry, June 2017

Paper: CSIR-NET June 2017 · Subject: Inorganic Chemistry · Chapter: Nuclear Chemistry · Topic: Nuclear Reactions Q Value · Marks: 2 · Difficulty: Medium

Choose the correct statement for magnitude of threshold energy of an endoergic nuclear reaction between stationary nucleus and a moving projectile.
(a)It is greater than $|Q|$ of nuclear reaction.
(b)It has to be more than kinetic energy of a projectile.
(c)It is less than $|Q|$ of nuclear reaction.
(d)It has to be equal to kinetic energy of a projectile.
Answer
Answer: A ✓ checked by 4AB · confidence high
Explanation
Momentum conservation makes the threshold energy exceed |Q|: E_th = |Q|(1 + m_projectile/m_target) (a).

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